Abstract Laser induced fluorescence spectra for jet-cooled CaO have been used to examine the higher vibrational levels of the A′1Π(Xσπ−1) state (v = 10–17) and the v = 6–8 vibrational levels of the C1Σ+(Bσσ−1) state. A perturbation of v = 17 of the A′ state was evident, caused by a spin-orbit mediated interaction with the b3Σ+(Ω = 1)(Xσσ−1) v = 14 level. Ro-vibrational constants for the A′ state were obtained by fitting to the data for nominally unperturbed levels. The average radiative lifetime for the A′1Π(Xσπ−1) state v = 10–17 levels was 2.6 μs, with no measurable dependence on v. This was consistent with the theoretical prediction of a relatively small transition dipole moment for the A′1Π–X1Σ+ band system. A homogeneous perturbation of the C1Σ+(Bσσ−1) v = 7 level was examined by means of dispersed laser induced fluorescence (DLIF) and radiative lifetime measurements. The DLIF spectra clearly demonstrate that the perturbing Ω = 0+ state is a component of a triplet state. Intense transitions from this state to the a3Π(0+)(Xσπ−1) state were observed. Configurational arguments are presented that support assignment of the perturbing state as the v = 12 vibrational level of the previously unobserved g3Π(0+)(Bσπ−1) state.

中文翻译：

---

CaO 的 A'1Π 和 C1Σ+ 状态的扰动

摘要 射流冷却 CaO 的激光诱导荧光光谱已被用于检查 A′1Π(Xσπ−1) 状态 (v = 10–17) 的较高振动能级和 C1Σ+ 的 v = 6–8 振动能级。 (Bσσ−1) 状态。A' 状态的 v = 17 的扰动很明显，这是由自旋轨道介导的与 b3Σ+(Ω = 1)(Xσσ−1) v = 14 能级的相互作用引起的。A' 状态的旋转振动常数是通过拟合名义上未受干扰水平的数据获得的。A'1Π(Xσπ−1) 状态 v = 10-17 能级的平均辐射寿命为 2.6 μs，对 v 没有可测量的依赖性。这与 A' 相对小的跃迁偶极矩的理论预测一致1Π–X1Σ+ 带系统。C1Σ+(Bσσ−1) v = 7 水平的均匀扰动通过分散激光诱导荧光 (DLIF) 和辐射寿命测量进行了检查。DLIF 光谱清楚地表明，扰动 Ω = 0+ 状态是三重态的一个组成部分。观察到从该状态到 a3Π(0+)(Xσπ−1) 状态的强烈转变。提出了支持将扰动状态分配为先前未观察到的 g3Π(0+)(Bσπ−1) 状态的 v = 12 振动水平的配置参数。